Developing the strength of lower limbs, and improving the stability and agility of three main joints of lower limbs; good for the healing of inconvenience of bending and stretching of lower limbs, and muscular atrophy of lower limbs, rheumatoid arthritis, sciatica, sprain of the anklebone, etc.

Approaches

Sitting on the chair and step on the footboard. Stretching legs with force and recover slowly. Repeat.